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-rw-r--r--nix/scripts/list-runtime-roots.in116
1 files changed, 116 insertions, 0 deletions
diff --git a/nix/scripts/list-runtime-roots.in b/nix/scripts/list-runtime-roots.in
new file mode 100644
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+++ b/nix/scripts/list-runtime-roots.in
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+#!@GUILE@ -ds
+!#
+;;; Guix --- Nix package management from Guile. -*- coding: utf-8 -*-
+;;; Copyright (C) 2012 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of Guix.
+;;;
+;;; Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with Guix. If not, see <http://www.gnu.org/licenses/>.
+
+;;;
+;;; List files being used at run time; these files are garbage collector
+;;; roots. This is equivalent to `find-runtime-roots.pl' in Nix.
+;;;
+
+(use-modules (ice-9 ftw)
+ (ice-9 regex)
+ (ice-9 rdelim)
+ (ice-9 popen)
+ (srfi srfi-1)
+ (srfi srfi-26))
+
+(define %proc-directory
+ ;; Mount point of Linuxish /proc file system.
+ "/proc")
+
+(define (proc-file-roots dir file)
+ "Return a one-element list containing the file pointed to by DIR/FILE,
+or the empty list."
+ (or (and=> (false-if-exception (readlink (string-append dir "/" file)))
+ list)
+ '()))
+
+(define proc-exe-roots (cut proc-file-roots <> "exe"))
+(define proc-cwd-roots (cut proc-file-roots <> "cwd"))
+
+(define (proc-fd-roots dir)
+ "Return the list of store files referenced by DIR, which is a
+/proc/XYZ directory."
+ (let ((dir (string-append dir "/fd")))
+ (filter-map (lambda (file)
+ (let ((target (false-if-exception
+ (readlink (string-append dir "/" file)))))
+ (and target
+ (string-prefix? "/" target)
+ target)))
+ (scandir dir string->number))))
+
+(define (proc-maps-roots dir)
+ "Return the list of store files referenced by DIR, which is a
+/proc/XYZ directory."
+ (define %file-mapping-line
+ (make-regexp "^.*[[:blank:]]+/([^ ]+)$"))
+
+ (call-with-input-file (string-append dir "/maps")
+ (lambda (maps)
+ (let loop ((line (read-line maps))
+ (roots '()))
+ (cond ((eof-object? line)
+ roots)
+ ((regexp-exec %file-mapping-line line)
+ =>
+ (lambda (match)
+ (let ((file (string-append "/"
+ (match:substring match 1))))
+ (loop (read-line maps)
+ (cons file roots)))))
+ (else
+ (loop (read-line maps) roots)))))))
+
+(define (lsof-roots)
+ "Return the list of roots as found by calling `lsof'."
+ (catch 'system
+ (lambda ()
+ (let ((pipe (open-pipe* OPEN_READ "lsof" "-n" "-w" "-F" "n")))
+ (define %file-rx
+ (make-regexp "^n/(.*)$"))
+
+ (let loop ((line (read-line pipe))
+ (roots '()))
+ (cond ((eof-object? line)
+ (begin
+ (close-pipe pipe)
+ roots))
+ ((regexp-exec %file-rx line)
+ =>
+ (lambda (match)
+ (loop (read-line pipe)
+ (cons (string-append "/"
+ (match:substring match 1))
+ roots))))
+ (else
+ (loop (read-line pipe) roots))))))
+ (lambda _
+ '())))
+
+(let ((proc (format #f "~a/~a" %proc-directory (getpid))))
+ (for-each (cut simple-format #t "~a~%" <>)
+ (delete-duplicates
+ (let ((proc-roots (if (file-exists? proc)
+ (append (proc-exe-roots proc)
+ (proc-cwd-roots proc)
+ (proc-fd-roots proc)
+ (proc-maps-roots proc))
+ '())))
+ (append proc-roots (lsof-roots))))))